I have iDeneb 1.4 10.5.6 installed with the Sleep kernel, because I have a p4, and I get that kernel panic whenever I try to mount a dmg. Now, I know I need to update the kernel, but what do I do?

Do I upgrade to voodoo, (which, btw doesn't work on my setup, I just get a kernel panic on startup whenever I choose that during install) or is there some way to upgrade to a different version of sleep?